{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T15:51:32.771Z","years_from_j2000":26.681,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-100508-b","name":"HD 100508 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":106.83186920836388,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":173.3014057,"dec_deg":-67.0546386,"epoch_ra_deg":173.599778,"epoch_dec_deg":-67.202963,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 100508","semi_major_axis_km":914042989.977,"periapsis_km":null,"mass_kg":2.2777495197080646e+27,"mass_msun":0.00114551,"constellation":"Musca","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/hd-100508-b","radius_km":87379.97,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 100508","host_v_mag":7.74,"eccentricity":0.42,"uncertainties":{"mass_kg":[3.4166242795620975e+26,5.6943737992701615e+26],"distance_ly":[0.10339157173620767,0.10339157173620767],"eccentricity":[0.02,0.02],"host_mass_solar":[0.12,0.12],"inclination_deg":[16,19],"host_radius_solar":[0.055529,0.043792],"host_temperature_k":[112,112],"semi_major_axis_km":[41887403.796000004,37399467.675],"orbital_period_days":[42,42],"argument_of_periastron_deg":[4.2,4.1]},"host_mass_solar":0.94,"inclination_deg":62,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.0179,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"K1 IV","host_temperature_k":5419,"orbital_period_days":5681,"periastron_epoch_bjd":2447556,"equilibrium_temperature_k":106.66,"argument_of_periastron_deg":99.1},"designations":[{"catalog":"Exoplanet","designation":"HD 100508 b"},{"catalog":"Host star","designation":"HD 100508"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}